3 SCREW SIZES: Each knob comes with 3 sizes of screws to meet different needs GLOSSY APPEARANCE: With clear crystal glass and alloy base, glittering and sparkling appearance, and beautiful diamond shape, when the light hits the facets of the knobs, they shine and leave beautiful prisms on the furniture. The knobs will add glamor to any piece of furniture and a touch of elegance to bedrooms. bedroom door, chests of drawers, bookcase, kitchen cupboard, etc. Our knobs are a good decoration for your home or office. PREMIUM MATERIAL: Diamond cut clear crystal knob with chrome alloy base. adhesion between crystal and base are improved, can support crystal for a long time. Each button is individually wrapped against scratches. EASY TO INSTALL: Drill a hole on the board where you want to install, pass through the hole with the screw, then tighten the screw to secure the knob. Our screws have a unique shank design and normally do not require washers.